So you want a skilled technician in control. But not all counselors are trained to navigate the rough winds of a relationship in distress. And they can do more harm than good, some experts say.

"Unfortunately, many therapists have not been trained to step out of the who's-to-blame dynamic," said Diane Gehart, professor of marriage and family therapy at California State University at Northridge.

While any number of social workers, psychologists and other counseling professionals can perform couples therapy — and many do it well — that doesn't necessarily mean they've had much experience with it or that they've gone through the specialized course work required of licensed marriage and family therapists.

And when a therapist accustomed to treating individuals brings an individualistic approach to a couples session, it can backfire, Gehart said.

Unlike traditional psychodynamic therapy for individuals, the most effective couples therapy doesn't plumb the unconscious or delve into the past or seek to identify the psychopathologies causing people to behave in destructive ways, Gehart said.

Rather, couples therapy works best when it focuses on the systemic interactions between partners, she said — that is, how the relationship dynamics are perpetuating patterns that are driving them apart and what positive steps each person can take to change them.

"You learn to treat the system, not the symptom," said Love, an Austin, Texas-based author of several relationship books. "If you don't pay attention to the system, one person will feel betrayed, left out, reactive and not want to come back to therapy."

So in the classic case of the stoic husband and emotional wife, good couples therapists might identify how his indifference is driving her panic, and vice versa, so both can make changes and neither shoulders all the blame, Gehart said. What they don't do is finger the man's inability to express his feelings as the central problem — a sure way to drive away a guy who probably didn't want to be there in the first place.

Love said people often come to therapy in hopes of getting the therapist to agree that their partner is, in fact, a useless lump or a horrid nag. And it's hard not to get sucked into their worldview.

Before she became trained as a couples therapist, Love said, "I thought a couple came in, and they would tell me their story, and I would say, you're right, you're wrong, and I would break the tie."

But siding with one partner or even the perception of siding with one partner hurts the cause.

The real client in couples counseling is the relationship, Love said. And it needs a calm and cogent arbiter whom both partners trust to direct the session when temperatures in the room rise.

"Can you cut people off? Can you intervene? Can you redirect? Can you draw out emotions? Can you build a bridge between the two people?" Love said.

Bill Doherty, director of the Minnesota Couples on the Brink Project at the University of Minnesota, has been writing about bad couples therapy for years. One of the most important questions people should ask when seeking a therapist, he said, is how much of their practice is devoted to couples. Look for at least 30 percent.

Among the missteps a well-meaning but inexperienced counselor can take, Doherty said:

-- Appearing to side with one partner over the other.

-- Allowing hot conflict, including letting partners interrupt each other and blame or criticize each other.

-- Offering bromides about good communication but little else.

-- Failing to give homework that each partner can work on for the next session.